The 12 factor app states that applications should log to standard out and standard error, thus not concerting themselves with the storage and processing of their log stream. That's a good start point, but we need more than that. The 12.1 factor app does these three things:

1. Supports a LOG_LEVEL configuration option
2. Uses a machine readable format, such as JSON, in production
3. Treats log streams as a telemetry source

Mentioned in Show

• The 12 Factor App
• The 12.1 Factor App: Config
• Rails with Jason

Resources

• The 12 Factor App
• Jay Kutner on the 12 Factor App via SE Radio

Books

• The DevOps Handbook by Gene Kim, Jez Humble, John Willis, Patrick Debois
• Accelerate by Nicole Forsgren, Jez Humble, Gene Kim